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We find about 1 bad x13 every 2 weeks. It's getting to be a pain and customers aren't very happy about it. We've only had a couple bad out of our installations but lots from service calls on other equipment, most of the time it's bc of inadequate ducting and/or condensation.

By set speeds, I meant you have speed selection terminals on the motor.

There actually called torque taps and there 24 volts that are set/programed by the mfg. for the furnace/air handler the motor is installed in, it's not really recommended that the tech play with the torque taps.

__________________________________________________ _______________________“Experience is a hard teacher because she gives the test first, the lesson afterwards". -Vernon Law-

The x13 is a single phase motor/module assembly. 3 phase motors are typically belt driven in my experience. I haven't seen a 3 phase ECM/x13. But I don't work on commercial equipment. Mostly residential. Did you verify you are not loosing a leg of power ?

Rheem /Ruud has a 3 phase pachage unit that uses a single phase X13 blower motor. And they fail.

Rheem /Ruud has a 3 phase pachage unit that uses a single phase X13 blower motor. And they fail.

Yes, new part failures are becoming more common everyday, now Carrier is going to the LG compressors, guess pretty soon we wont have time to do our everyday service calls, for all the warranty calls we will have.

__________________________________________________ _______________________“Experience is a hard teacher because she gives the test first, the lesson afterwards". -Vernon Law-

I had two recent classes that touched on this. One was a RSES with a Nordyne Rep., the other a Carrier distributor with a class specifically dedicated to troubleshooting ECMs. They both swore up and down that the issues were becoming less, and in my limited experience in kinda seems so. It's been many a week since I've had to deal with one, and we've installed a boatload of 'em.

However...you can't ignore the fact that the reason they keep having these classes is because there was/is a huge issue and they are sick of giving out warranty motors and modules together - when they well know by now it is the modules that are the culprit as much as 90% of the time.

I just got yet another RSES bulletin in the mail over the weekend concerning this very issue. As noted above, the X13s now have a thick rubber matting protecting the module circuitry as they figured out that moistue really messes with these things.

I have no clue as to how they are attempting to deal with the power surge issue, other than to suggest additional surge protection...